I have new boots in my closet and are the Basic flat Chelsea ankle boots from Stradivarius. In the pictures they look brown, but they are black and what I love about them is the elastic band on the sides that I was looking for in a long time. This style is very common in multiple brands, but mostly all I found were in the heels version. I wanted them for a everyday use, as I walk a lot.
They weren't very expensive for their quality, €39.99 (the same price in pounds) and they are very comfortable.